GRADY (AP) — Officials say an Arkansas inmate serving a life sentence on a murder conviction has died in prison.

Arkansas Department of Corrections spokeswoman Shea Wilson says 55-year-old Robbin Ridling died Sunday morning in the infirmary of the Cummins Unit prison. Wilson says the staff physician pronounced Ridling dead of natural causes and that the death is not considered suspicious.

According to the Texarkana Gazette (http://bit.ly/1pLRqBb ), Ridling was convicted in 2003 for the death of 65-year-old Roy Baskett. Authorities say Baskett's remains were discovered in September 2002 in the Hope Upland Wildlife Area.